Etymology
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casuist (n.)

c. 1600, "one who studies and resolves cases of conscience," from French casuiste (17c.) or Spanish casuista (the French word also might be from Spanish), Italian casista, all from Latin casus "case" (see case (n.1)) in its Medieval Latin sense "case of conscience." Often since 17c. in a sinister or contemptuous sense "over-subtle reasoner, sophist." Related: Casuistic; casuistical; casuistically.

updated on October 22, 2017

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Definitions of casuist from WordNet

casuist (n.)
someone whose reasoning is subtle and often specious;
Synonyms: sophist
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.